History 141 Land tenure 86 Architecture 62 Arquitectura 59 urban and land use planning 50 Historia 39 Planificación urbana y uso de las tierras 36 more ... History and criticism 33 Land reform 32 Tenencia de la tierra 32 Land use 31 Law and legislation 31 Politics and government 31 Education 26 Philosophy 26 Social aspects 23 Criticism and interpretation 22 Educación 20 Social conditions 18 Law 17 Filosofía 16 Indians of South America 16 Study and teaching 16 Derecho 14 Management 14 Planificación urbana y de uso de las tierras 14 Economic conditions 13 Reforma agraria 13 Urbanization 13 Agriculture 12 less ...